Horizontal and vertical lines

Front

What is the equation of a vertical line?

Back

x = a, where 'a' is a constant.

Front

What is the equation of a horizontal line?

Back

y = b, where 'b' is a constant.

Front

What does it mean if a line has an undefined slope?

Back

It means the line is vertical.

Front

What does it mean if a line has a slope of 0?

Back

It means the line is horizontal.

Front

How can you identify a vertical line on a graph?

Back

A vertical line goes straight up and down and does not cross the x-axis.

Front

How can you identify a horizontal line on a graph?

Back

A horizontal line goes straight left and right and does not cross the y-axis.

Front

What is the slope of a vertical line?

Back

Undefined.

Front

What is the slope of a horizontal line?

Back

0.

Front

If a line passes through the point (5, 0), what is its equation if it is vertical?

Back

x = 5.

Front

If a line passes through the point (0, -3), what is its equation if it is horizontal?

Back

y = -3.